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Mismatch Repair01:20

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Mitonuclear interactions influence multiple sclerosis risk.

Maxim Kozin1, Olga Kulakova1, Ivan Kiselev1

  • 1Pirogov Russian National Research Medical University, Moscow 117997, Russia.

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Summary
This summary is machine-generated.

Mitochondrial DNA variants and their interactions with nuclear genes are linked to multiple sclerosis (MS) heritability. Specific mitochondrial variants, combined with nuclear gene variants, show significant associations with MS risk.

Keywords:
Genetic polymorphismMitochondrial genomeMitonuclear interactionMultilocus analysisMultiple sclerosisNuclear genomePVT1

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Area of Science:

  • Genetics
  • Neuroimmunology
  • Mitochondrial Biology

Background:

  • Multiple sclerosis (MS) is a complex central nervous system disease involving autoimmune inflammation, demyelination, and neurodegeneration.
  • Genetic factors contribute significantly to MS heritability, but known nuclear genome variants explain only a portion of this inheritance.
  • Mitochondrial DNA (mtDNA) polymorphisms and mitonuclear interactions are potential contributors to the 'missing heritability' in MS.

Purpose of the Study:

  • To investigate the association of specific mitochondrial DNA polymorphisms with multiple sclerosis (MS).
  • To explore the role of interactions between mitochondrial and nuclear genomes in MS susceptibility.
  • To identify epistatic interactions between mitochondrial and nuclear genetic variants in MS.

Main Methods:

  • Analysis of 10 mitochondrial DNA polymorphisms in 540 MS patients and 406 healthy controls.
  • Examination of biallelic combinations between 10 mtDNA variants and 35 immune-related nuclear gene variants.
  • Statistical analysis to assess associations and identify epistatic interactions.

Main Results:

  • The mitochondrial variant m.9055*G was significantly associated with MS (Pf = 0.027).
  • Specific combinations of mitochondrial variants (m.4216, m.4580, m.13708) with nuclear gene variants (IL7R, CLEC16A, CD6, CD86, PVT1) were associated with MS (Pf = 0.0036-0.00030).
  • An epistatic interaction was identified between m.13708*A and PVT1 rs4410871*T, suggesting genuine mitonuclear epistasis.

Conclusions:

  • Mitochondrial DNA variants contribute to MS susceptibility.
  • Mitonuclear interactions, including epistatic effects, play a role in the genetic architecture of MS.
  • These findings highlight the importance of considering both nuclear and mitochondrial genomes in understanding MS heritability.